François Dupressoir
@francois.dupressoir.eu
Proof nerd, dad, computer scientist.
It's fine as long as all voters get a chance to double vote.
November 25, 2025 at 7:50 AM
It's fine as long as all voters get a chance to double vote.
Perfect time to switch to vi.
November 21, 2025 at 7:31 AM
Perfect time to switch to vi.
A joyful face for a joyful book.
October 8, 2025 at 8:23 AM
A joyful face for a joyful book.
This is exactly the setup in this 5-bit experiment: the DL instance is set up in a subgroup of the curve of order 2^5 = 32.
There's a reason we usually pick prime order subgroups.
There's a reason we usually pick prime order subgroups.
July 20, 2025 at 7:27 PM
This is exactly the setup in this 5-bit experiment: the DL instance is set up in a subgroup of the curve of order 2^5 = 32.
There's a reason we usually pick prime order subgroups.
There's a reason we usually pick prime order subgroups.
Uh... Working in a subgroup of order 32 seems... ill advised. Even with a 256-bit key, if I pick 2^256 as the order of the group I set up my discrete logarithm instance in, Pohlig-Hellman gives a classical attack in 512 guesses max. (256 on average.) No need for a quantum computer here.
July 20, 2025 at 7:27 PM
Uh... Working in a subgroup of order 32 seems... ill advised. Even with a 256-bit key, if I pick 2^256 as the order of the group I set up my discrete logarithm instance in, Pohlig-Hellman gives a classical attack in 512 guesses max. (256 on average.) No need for a quantum computer here.
You have 12 usable knuckles on each hand. (Usable because you can point to them nicely with your conveniently opposable thumb.)
June 29, 2025 at 5:08 PM
You have 12 usable knuckles on each hand. (Usable because you can point to them nicely with your conveniently opposable thumb.)
Just in case anyone feels really excited, this closed 10 days ago.
ICYMI... Tough, you missed it.
ICYMI... Tough, you missed it.
June 28, 2025 at 2:17 PM
Just in case anyone feels really excited, this closed 10 days ago.
ICYMI... Tough, you missed it.
ICYMI... Tough, you missed it.
Other governments are still (for now) linking government procurement and transition, and generally aligned on adoption. (France likes XMSS, Germany also likes Classic McEliece.)
Also strong signs that other countries are picking up the advocacy piece.
I'm not going to say it so I don't jinx it.
Also strong signs that other countries are picking up the advocacy piece.
I'm not going to say it so I don't jinx it.
June 24, 2025 at 4:54 PM
Other governments are still (for now) linking government procurement and transition, and generally aligned on adoption. (France likes XMSS, Germany also likes Classic McEliece.)
Also strong signs that other countries are picking up the advocacy piece.
I'm not going to say it so I don't jinx it.
Also strong signs that other countries are picking up the advocacy piece.
I'm not going to say it so I don't jinx it.
That is called a cryptographic reduction.
June 20, 2025 at 4:47 PM
That is called a cryptographic reduction.
The joys of the Outlook web client.
June 18, 2025 at 4:28 PM
The joys of the Outlook web client.
"we are simply moving assumptions to a different level of the stack" is all cryptography has ever been about, though. In the end, it's all about informing risk management decisions and moving risk.
The fact that there's nerdy stuff in the way means we get clever people working on it, which is nice.
The fact that there's nerdy stuff in the way means we get clever people working on it, which is nice.
June 14, 2025 at 11:17 AM
"we are simply moving assumptions to a different level of the stack" is all cryptography has ever been about, though. In the end, it's all about informing risk management decisions and moving risk.
The fact that there's nerdy stuff in the way means we get clever people working on it, which is nice.
The fact that there's nerdy stuff in the way means we get clever people working on it, which is nice.
I think you simplified that a bit too far, there...
The article (and its actual title) are very clear that being fluent with multiplication is good, but that the practice of teaching to the test is not.
The article (and its actual title) are very clear that being fluent with multiplication is good, but that the practice of teaching to the test is not.
June 14, 2025 at 10:50 AM
I think you simplified that a bit too far, there...
The article (and its actual title) are very clear that being fluent with multiplication is good, but that the practice of teaching to the test is not.
The article (and its actual title) are very clear that being fluent with multiplication is good, but that the practice of teaching to the test is not.
A tool that fails safe is more worthy of trust than a tool that fails badly, though. Given that a hybrid KEM is a KEM, I expect it to be made by the tool makers, not by the tool users.
June 7, 2025 at 4:36 PM
A tool that fails safe is more worthy of trust than a tool that fails badly, though. Given that a hybrid KEM is a KEM, I expect it to be made by the tool makers, not by the tool users.
Sorry I missed it, and happy birthday!
May 8, 2025 at 7:51 PM
Sorry I missed it, and happy birthday!
I might need to start reining in the beard. I look very preacher-y.
Thanks for organising. Looking forward to participate without standing at the front next year :)
Thanks for organising. Looking forward to participate without standing at the front next year :)
May 4, 2025 at 5:24 PM
I might need to start reining in the beard. I look very preacher-y.
Thanks for organising. Looking forward to participate without standing at the front next year :)
Thanks for organising. Looking forward to participate without standing at the front next year :)
I'd like a lawyer, now.
April 18, 2025 at 9:27 AM
I'd like a lawyer, now.
I simply read the second "breaking" as in breaking news and temporarily found you extremely clever.
April 18, 2025 at 8:15 AM
I simply read the second "breaking" as in breaking news and temporarily found you extremely clever.
Douglas (@douglas.stebila.ca), Cas and Vincent are excellent speakers indeed. Much less sure about that second guy.
April 3, 2025 at 8:13 PM
Douglas (@douglas.stebila.ca), Cas and Vincent are excellent speakers indeed. Much less sure about that second guy.